Physical Connection - Danfoss 5000 Flux Manual

The indicated lengths in the tables are valid on the
condition that bus cables with the following pro-
perties are used:
– Impedance: 135 to 165 Ohm at a measuring
frequency of 3 to 20 MHz
– Resistance: < 110 Ohm/km
– Capacity: < 30 pF/m
– Damping: max. 9 dB across the entire cable
length
– Cross-section: max. 0,34 mm pursuant to
AWG 22
– Wire type: twisted pair, 1 x 2 or 2 x 2 or 1 x 4
conductors
– Shielding: copper-braided or braided and
foil laminated

Physical connection

The PROFIBUS option card will be connected to
the bus line (data line) at terminals 62 and 63.
Data line "B" (TxD/RxD-P) will be connected to
terminal 62 and data line "A" (TxD/RxD-N) to termi-
nal 63. A master with a voltaically insulated bus
driver and overvoltage protection (e.g. Z diode) is
recommended.
Protective measures for EMC
It is recommended to carry out the following pro-
tective measures for EMC in order to ensure a
trouble-free operation of the PROFIBUS network.
Additional notes concerning the subject of EMC
can be found in the project manual for the
VLT5000 series (MG.50.Cx.yy) and in the manual for
the Profibus master.
6
VLT ® 5000/5000 Flux/6000 HVAC/8000 AQUA PROFIBUS
It is recommended to use the same cable type
throughout the entire network in order to avoid
mismatches of the impedance.
The figures in the following description indicate the
maximum permitted number of stations in each
segment. These figures do not refer to the station
addresses, since each station in the network must
have an unambiguous address.
Cable setup
The PROFIBUS communications cable must be
kept at a distance from the motor and braking
resistance cables in order to avoid high-frequency
line failures from one cable to another. As a rule, a
distance of 200 mm is sufficient. In general, it is a
good idea to keep the greatest possible distance
between the cables, especially if they run parallel
for an extended distance.
If the PROFIBUS cable has to cross a motor and
braking resistance cable, it should occur at a
90 degree angle.
The applicable national and local regulations,
for example with respect to protective
earthing, must be observed.
MG.90.D1.02 – VLT is a registered Danfoss trademark
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